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SEGMENTS INFORMATION (Revenues by Customer Location) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | $ 652,243 | $ 588,103 | $ 1,935,985 | $ 1,661,023
United States |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 371,366 | 340,803 | 1,106,459 | 959,471
United Kingdom |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 77,519 | 74,992 | 251,928 | 209,773
Switzerland |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 50,399 | 38,781 | 144,158 | 110,378
Netherlands |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 28,827 | 22,161 | 81,973 | 63,816
Russia |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 27,963 | 23,668 | 69,372 | 62,020
Germany |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 22,172 | 20,940 | 62,163 | 59,716
Canada |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | 18,219 | 17,582 | 52,724 | 50,339
Other locations |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | $ 55,778 | $ 49,176 | $ 167,208 | $ 145,510

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